I can't set up a thunderbird account

is that because you get some4 error? Perhaps share it so we might be able to do more than offer wild guesses. Or just disable your antivirus program, they appear to do a very good job of messing up the new account wizard.

Although some providers require you top jump through hoops on their web site enabling this and that if you use av mail client as they do not serve adds. No revenue in paying customers not using the advertising plagued web pages they call webmail